1. Staff Engineer, Sequoia Engineering and Environmental, Inc., St. Louis, MO 63178; formerly, Graduate Student, Dept. of Civil and Environmental Engineering, South Dakota School of Mines and Technology, Rapid City, SD 57701.
2. Research Assistant, Dept. of Civil Engineering, Istanbul Technical Univ., Ayazaga, Istanbul 34469, Turkey.
3. Assistant Professor, Civil, Construction, and Environmental Engineering, Iowa State Univ., Ames, IA 50011 (corresponding author).
4. Professor, Dept. of Civil and Environmental Engineering, Univ. of Maryland, College Park, MD 20742.